<template>
  <div class="list" ref="wrapper">
    <div>
      <div class="area">
        <div class="title border-topbottom">
          当前城市
        </div>
        <div class="button-list"><div class="button-wrapper"><div class="button">{{this.currentCity}}</div></div></div>
      </div>
      <div class="area">
        <div class="title border-topbottom">
          热门城市
        </div>
        <div
        class="button-list"
        v-for="hotcity of hot"
        :key="hotcity.id"
        @click="handleCityClick(hotcity.name)"
        ><div class="button-wrapper"><div class="button">{{hotcity.name}}</div></div></div>
      </div>
      <!-- 以下是对象循环 -->
      <div
        class="area"
        v-for="(city,key,index) of cities"
        :key="index"
        :ref="key"
      ><div class="title border-topbottom">
          {{key}}
        </div>
        <div class="item-list">
          <div
          class="item border-bottom"
          v-for="detailedCity of city"
          :key="detailedCity.id"
          @click="handleCityClick1(detailedCity.name)"
          >{{detailedCity.name}}</div>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
import Bscroll from 'better-scroll'
import {mapState, mapActions, mapMutations} from 'vuex'
export default {
  name: 'CityList',
  computed: {
    ...mapState({currentCity: 'city'})
    // 我想把vuex中state里的city数据拿过来取名叫currentCity
  },
  props: {
    cities: Object,
    hot: Array,
    letter: String
  },
  methods: {
    ...mapActions(['changeCityActions']),
    ...mapMutations(['changeCityMutations']),
    handleCityClick (city) {
      this.changeCityActions(city)
      //   this.$store.dispatch('changeCityActions', city)
      this.$router.push('/')
      // 组件接触Vuex的Actions
    },
    handleCityClick1 (city) {
      this.changeCityMutations(city)
      //   this.$store.commit('changeCityMutations', city)
      this.$router.push('/')
      // 组件接触Vuex的Mutations
    }
  },
  mounted () {
    this.scroll = new Bscroll(this.$refs.wrapper)
  },
  watch: {// 侦听器 letter属性变了做点事儿
    letter () {
      if (this.letter) {
        const element = this.$refs[this.letter][0]
        // 首先给每个城市区域都绑定字母，然后根据这个绑定的去选中dom元素
        this.scroll.scrollToElement(element)
        // 调用betterscroll这个插件 让滚动区自动滚到指定字母区域
      }
    }
  }
}

</script>

<style lang="stylus" scoped>
@import '~styles/variables.styl'
.border-topbottom
  &:before
    border-color:#ccc
  &:after
    border-color:#ccc
.border-bottom
  &:before
    border-color:#ccc
.list
  overflow:hidden
  position:absolute
  top:1.58rem
  left:0
  right:0
  bottom:0
  .title
    line-height:.54rem
    background:#eee
    padding-left:.2rem
    color:#666
    font-size:.26rem
  .button-list
    overflow:hidden
    padding:.1rem .6rem .1rem .1rem
    .button-wrapper
      width:33.33%
      float:left
      .button
        margin:.1rem
        padding:.1rem 0
        text-align:center
        border:.02rem solid #ccc
        border-radius:.06rem
  .item-list
    .item
      line-height:.76rem
      padding-left:.2rem

</style>
